2009-2010 Flicker Tale nominees

bully: 2 a : a blustering browbeating person; especially : one habitually cruel to others who are weaker -- www.merriam-webster.com
To prevent someone from being a "habitually cruel to others" person, that person would need to be taught different behaviors and want to change from a "habitually cruel person". A bully needs to be taught empathy and ways to boost their own self-confidence. A bully won't be changed by listening to someone say they shouldn't be a bully. Shouldn't the focus be on increasing the self-confidence of all kids. If a kid is self-confident in his actions and beliefs, then he could stand up to any criticism and won't feel the need to criticize others.
No one can change the actions or behaviors of another. We can only change our own actions or behaviors.